Besides geometries, ConnectorLine can also connect with UIMarker and Panel

index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Geometry - Connector Lines</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

      var layer = new maptalks.VectorLayer('vector').addTo(map);

      // blue circle
      var src = new maptalks.Marker(
        [-0.128449,51.503568],
        {
          symbol: {
            'markerType' : 'ellipse',
            'markerFill' : 'rgb(135,196,240)',
            'markerFillOpacity' : 0.8,
            'markerLineColor' : '#fff',
            'markerLineWidth' : 3,
            'markerWidth' : 120,
            'markerHeight' : 120
          }
        }
      );

      // red circle
      var dst = new maptalks.Marker(
        [-0.102149,51.503568],
        {
          'draggable' : true,
          'symbol': [
            {
              'markerType' : 'ellipse',
              'markerFill' : 'rgb(216,115,149)',
              'markerFillOpacity' : 0.8,
              'markerLineColor' : '#fff',
              'markerLineWidth' : 3,
              'markerWidth' : 70,
              'markerHeight' : 70
            },
            {
              'textName' : 'Drag\nMe',
              'textSize' : 18,
              'textFill' : '#fff',
              'textWrapCharacter' : '\n'
            }
          ]
        }
      );

      // connector line
      var line = new maptalks.ConnectorLine(src, dst, {
        showOn : 'always', //'moving', 'click', 'mouseover', 'always'
        arrowStyle : 'classic',
        arrowPlacement : 'vertex-last',// 'vertex-last', //vertex-first, vertex-last, vertex-firstlast, point
        symbol: {
          lineColor: '#34495e',
          lineWidth: 2
        }
      });

      layer.addGeometry(src, dst, line);

      var src2 = src.copy().translate(0, -0.01);
      var dst2 = dst.copy().translate(0, -0.01);
      // Arc Connector Line
      var line2 = new maptalks.ArcConnectorLine(src2, dst2, {
        arcDegree : 90,
        showOn : 'always',
        symbol: {
          lineColor: '#34495e',
          lineWidth: 2
        }
      });

      layer.addGeometry(src2, dst2, line2);

    </script>
  </body>
</html>
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